Torque ripple reduction in DTC of induction motor driven by three-level inverter with low switching frequency

A torque ripple reduction technique of direct torque control (DTC) for high power induction motors driven by three-level inverters with the inverter switching frequency limited around 0.5-1 kHz level is presented. It is noted that conventional two-level DTC algorithms to reduce torque ripple are devised for applications with relatively high switching frequency above 2-3 kHz and cannot accomplish satisfactory torque ripple reduction for three-level inverter systems with such lower switching frequencies. A new DTC algorithm, especially for low switching frequency inverter system, illustrates quite reduced torque ripple characteristics all over the operating speed region. Simulation and experimental results show effectiveness of the proposed control algorithm.

[1]  S. Sul,et al.  New direct torque control of induction motor for minimum torque ripple and constant switching frequency , 1999 .

[2]  Sanjib Kumar Panda,et al.  Direct torque control of induction motor-variable switching sectors , 1999, Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475).

[3]  Erich Flach.  Design of a Kalman filter for direct mean torque control , 1999 .

[4]  Alfonso Damiano,et al.  An Improved Look-up Table for Zero Speed control in DTC Drives , 1999 .

[5]  A. Tani,et al.  Analytical investigation of torque and flux ripple in DTC schemes for induction motors , 1997, Proceedings of the IECON'97 23rd International Conference on Industrial Electronics, Control, and Instrumentation (Cat. No.97CH36066).

[6]  Kyo-Beum Lee,et al.  Torque ripple reduction in DTC of induction motor driven by 3-level inverter with low switching frequency , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[7]  Nik Rumzi Nik Idris,et al.  Reduced torque ripple and constant torque switching frequency strategy for direct torque control of induction machine , 2000, APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058).

[8]  Ronnie Belmans,et al.  Direct torque control: application to crane drives , 1997 .